Criminal – Murder in first degree

Where a jury convicted a defendant of first-degree murder, the conviction should be affirmed, as (1) there was sufficient evidence to prove the defendant’s guilt, (2) the defendant's due process rights were not violated by the commonwealth’s contradictory theories of principal liability at the separate trials of the defendant and his codefendant and (3) no substantial risk of a miscarriage of justice occurred when the medical examiner testified during his direct examination about details in an autopsy report prepared by a nontestifying medical examiner.